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This isn’t some high performance cap. I know someone with a v12 Lamborghini that has a 1 bar cap. This is bmw perpetually making sure there is a client list for exploded tanks, hoses radiators and valley pans. Swapped mine out years ago and never looked back.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5 |
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Amen in to that! I swapped mine out when I did my cooling system refresh at 90k, I’m sitting just under 115k now so nearly 25k miles and no adverse affects (except my expansion tank probably won’t blow up again...) BMW part number is: 17 13 7 739 023 2005 X5 4.4i (04/05 build date) Titanium Silver w/Black Interior |
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Edit... part # is 17 13 7 639 023 - apologies for my fat fingers
2005 X5 4.4i (04/05 build date) Titanium Silver w/Black Interior |
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I’m at like 50k miles since switching cap. Use car year round. So yea.
Ty for part number. I was too lazy to look for it lol.
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2006 4.8is, Black on White. SOLD Sniff Sniff. 2017 F85 x5m, Black on Red. BEAST MODE "The older we grow the greater becomes our wonder at how much ignorance one can contain without bursting one's clothes." - Mark Twain Unlock OBC post 5 |
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Remember, the system is sealed, so whether you have a 1.4 bar or 2.0 bar cap, an overheating engine is going to expand into the ET which has a limited ability to relieve pressure before the entire system develops enough pressure to create a "new" relief (e.g., cracking the ET, blowing a hose, whatever is the weak point).
I have installed 1.4 bar caps on my BMW's, but as I've come to understand the system better, I'm not convinced it really makes much (if any) difference. The best thing you can do to minimize the chances of a pressure failure is to keep your coolant level at the minimum full level. I run mine with the top of the float stick just even with the top of the ET. The more full you run your ET, the less capacity it has to absorb coolant/pressure from the system. Remember that the cap does not vent externally. It only vents to the ET. AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather E53 2004 3.0 M54 AT Toledo Blue with Gray Leather E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten) |
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I agree on the 100,000 mile service regimen for the cooling system. I tend to do it all at once every 100,000 miles. Is it wasteful? Maybe. But it gives me the warm and fuzzies so that's what I do.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
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Every other car I've ever owned has vented externally if you overfill, making it simple to fill coolant after a flush or maintenance. That decision still has me a little baffled.
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2003 3.0 5MT Topasblau Purchased in 2016 and surprisingly still running |
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I'm pretty sure the coolant res is in the active loop and already pressurized. Not sure how you would vent into a pressure zone. That said I never saw an overflow tube either
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
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AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather E53 2004 3.0 M54 AT Toledo Blue with Gray Leather E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten) |
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